Drilling-machine.



A. HOSSFELD.

DRILLING MACHINE.

APPLICATION FILED JULY 1. 1914 Patented Feb. 2, 1915.

2 SHEETS-SHEET}.

9 Attorneys A. HOSSFELD.

DRILLING MACHINE. APPLICATION FILED JULY 1, 1914.

1,127,003. Patented Feb. 2, 1915.

2 SHEETS-SHEET 2.

Witnesses Inventor,

by W Attorney;

ALBERT HOSSFELD, OF LEWISTON, MINNESOTA.

DRILLING-MACHINE.

Specification of Letters Patent.

Patented Feb. 2, 1915.

Application filed July 1, 1914. Serial No. 848,432.

To all whom it may concern:

Be it known that I, ALBERT HOSSFELD, a citizen of the United States, residing at Lewiston, in the county of \Vinona and State of Minnesota, have invented a new and useful Drilling-Machine, of which the following is a specification.

The device forming the subject matter of this application is a drill adapted to be employed in stone working.

One object of the present invention is to provide novel means for reciprocating the drill in the direction of its length and for permitting the drill to feed downwardly as the stone is worn away by the drill.

Another object of the invention is to provide novel means for rotating the drill as it is reciprocated.

It is within the scope of the invention to improve generally and to enhance the utility of devices of that type to which the present invention appertains.

With the above and other objects in View which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the invention.

In the accompanying drawings :-Figure 1 shows in side elevation, adrill embodying the present invention, portions being broken away; Fig. 2 is an elevation of the drill herein disclosed, it being presupposed that the observer is looking in the direction of the arrow X in Fig. 1; Fig. 3 is a top plan of the drill; Fig. 4 is a transverse sec- I tion taken approximately on the line 4.--1 of Fig. 1, parts being omitted; Fig. 5 is an elevation in the nature of a diagram and illustrating the drill as the same will appear when used horizontally to operate upon the breast of a working.

In carrying out the present invention there is provided a supporting frame which is denoted generally by the numeral 1. The frame 1 embodies a post 2 provided at one end with diverging arms 3 which may be described as lower arms, presupposing that the structure is employed in an upright position as delineated in Fig. l.

Projecting from the post 2 is a rearwardly extended brace 4 which, as shown at 5 in Fig. 1 is slotted vertically.

Connected with the brace 4 are top bars 6, the top bars 6 being connected with the post 2 and being extended forwardly of the post to form upper arms 7 the contour of which is best seen in Fig. 3.

For the support of the frame 1 above described there is provided a leg 8 passing upwardly through the slot 5 in the brace 4 and having its upper end disposed between the top bars 6, the upper end of the leg 8 being journaled on r a bolt 9 extended through the top bars 6, the latter elements being contractible to a limited extent, so that when the bolt 9 is tightened up, the leg 8 will be held frictionally against swinging movement.

Clamps 10 and 11 are provided, Fig. 1 being compared with Fig. 3. The clamps l0 and 11 at one end are notched as shown at 12 in-Fig. 1 so as to straddle the respective top bars 6 of the frame 1. A bolt 14 passes through the forward end of the clamp 10 of the frame 1. Located between the clamp 10 and the adjacent arm 7 of the frame 1 and journaled upon the bolt 14 is a leg 15. By tightening up the bolt l t, the leg 15 may be held in adjusted positions.

A bolt 16 passes through the clamp 11 and engages the adjacent arm 7 of the frame 1. The upper end of a leg 17 is mounted to swing on the bolt 16 and is held between the clamp 11 and the arm 7. A leg 18 is mounted to swing on the bolt 16 and a leg 19 is mounted to swing on the bolt 9. The bolts 9 and 16 pass through an angular clamp 20 and by tightening the bolts 16 and 9, the legs 18 and 19 may be held in adjusted positions.

When the machine operates vertically, as

shown in Figs. 1 and 2, the legs 15, 17 and with projecting fingers 23 adapted to support the usual retaining weights (not shown) Guide rods25 of any desired length are carried by the arms 3 and 7 of the main frame 1 and are held therein by set screws 24 threaded into the arms. Adjacent their 7 upper ends, the guide rods 25 are connected by a vertically adjustable yoke 26 heldin place by set screws 27.

The guide rods '25 support for reciprocation, a carriage 28 whereby a reciprocating motion is imparted to the drill 33. The car- 7 at its upper end with an extension 31 and, at the lower end of the bar 29 there is an 1 extension 32.

Guided for reciprocating movement in the extensions 31 and 32 of the carriage 28 is a drill 33. Intermediate its ends, the drill 33v is surrounded by a split grip 34 held frictionally to the drill by means of bolts 35. Surrounding the drill 33 above the grip 34 and adapted at times to cooperate with the upper extension 31'of the carriage is a compression spring 36. A lower compression spring 37 surrounds the drill 33 below the grip 34 and cooperates with the lower extenv sion 32 of the carriage 28.

J ournaled on the drill 33 and located between the lower spring 37 and the grip 34 is a clutch 38 in the form of a plate or disk.

'One end of a link 39 is loosely mounted in any one of a series of openings 40 formed in the clutch 38, the other end of the link 39 being loosely pivoted to a bracket 41 secured to and outstanding from one of the guide rods 25.

A spring 42 is coiled around the bracket 41 and is secured thereto at one end, the other end of the spring 42 being prolonged to form an arm 43 which bears on top of the link 39.

Loosely connected as shown at 44 to one of the guide rods 25 is a stop rod 45 passing through the disk-like clutch 38 and provided at its lower end with a head 46 which 0 operates with the clutch 38 in a manner to be set forth hereinafter.

J ournaled for rotation in the upper ends of the post 2 and the brace 4 of the frame 1 is a shaft 47 equipped at one end with a crank 48 operatively connected with a pitman 49 terminating, as shown in Fig. 4, 1n a wrist pin 50 mounted to rock in the main bar 29 of the carriage 28. A collar 51 surrounds the shaft 47 and cotiperates with the upper end of the post 2 to revent longitudinal movement of the sha t. Upon that extremity of the shaft 47 which is remote from the crank 48 is secured an abutment collar 52.

Journaled upon the shaft 47 and coiiperating with the abutment collar 52 is a driving element 53, in the present instance shown in the form of a pulley. One end of the hub of the driving wheel 53 coiiperates with the abutment collar 52 and the other end of the hub of the pulley coiiperates with a friction disk 54 on the shaft 47, the friction disk 54 being adapted to coiiperate with aclutch 55 longitudinally slidably mounted on the shaft 47 for movement in the direction of the axis of the shaft.

The clutch 55 is equipped with a spiral end face 56 adapted to engage with a projection 57 outstanding from the brace portion 4 of the main frame 1. A lever 58 is pivoted to the clutch 55 and carries a rigid, forwardly presented pawl 59 cotiperating with a toothed segment 60.

An arched spring 61 is secured at one end to thelever 58, the other end of the spring 61 hearing against the smooth forward edge of the segment 60. When the lever 58 is swung transversely of the shaft 47,the clutch 55 is rotated on the shaft, the spiral end face 56 of the clutch coiiperating with the projection 57 on the machine frame to move the clutch 55 longitudinally of the shaft. In this manner, through the medium of the friction disk 54 and the abutment disk 52, the driving wheel 53 maybe connected more or less securely with the shaft 47 to the end that when movement of the drill '33 is sud denly arrested from any cause, a breaking of any of the constituent parts of the mechanism will be avoided. The pawl 59 cooperates with the segment 60 to hold the lever 58 in adjusted positions and the spring arm 61 serves to maintain the pawl 59 engaged with the segment. When the shaft 47 is rotated through the medium of the driving wheel 53, the pitman 49 will,through the instrumentality of the crank 48, impart a sliding movement to the carriage 28, the latter reciprocating on the guide rods 25. When the carriage 28 is elevated, the drill 33 will be elevated through the coiiperation between the lower extension 32 of the carriage 28, the spring 37, the clutch 38 and the -between the grip 34 and the extension 31.

The spring 36, being thus compressed, serves to start the drill 33 abruptly downward when the downward movement of the carriage 2 8 begins.

The grip 34 is frictionally held upon the drill 33 by the bolts 35 and as the stone beneath the drill wears away, the drill will automatically feed downwardly through the grip. When the drill 33 moves upwardly, the lower spring 37 is compressed and presses the clutch 38 frictionally against the lower end of the grip 34. An operative connection is thus established between the clutch 38 and the grip 34 whereby, when the clutch 38 is rotated, the grip 34 and the drill 33 will be rotated also, the necessity for rotating a drill of this type as it is reciprocated being common and well known. When the drill 33 moves downwardly, the compressi on of the lower spring 37 is lessened, and consequently, the frictional effort of the clutch 38 on the lower end of the grip 34 islessened, so that the clutch may rotate or swing on the drill 33, independently of the grip. Now when the drill 33 is being elevated and while the clutch 38 is held against the lower end of the grip 34 by the comthe drill rod 33, the spring 42 and its arm.

ing operated upon.

pressed lower spring 37, the link 39 tilts upon its pivotal connection with the bracket 41 and rotates the clutch 38, the grip 34 and 43 being put under tension. So soon as the drill 33 starts to move downwardly, and when the compression of the lower spring I 37 on the clutch 38 is released, the spring 42 and its arm 43 actuates the link 39 and swings the clutch 38 around to obtain a new the head 46 on the lower end of the stop.

rod, the drill 33 moving downwardly through the grip 34, in which it is tightly but frictionally and movably held, until the drill engages the surface of the material be- This downward slidingmovement of the drill 33 in the grip 34 takes place of course in a series of also imperceptible steps, the drill accommodating itself continuously and automatically to the material, as the latter is cut away.

Although the guide rods 25 are adjustable in the frame 1 and although the yoke 26 may be adjusted upon the guides, the guides, the yoke and the bracket 41 are fixed with respect to the frame, during the operation of the machine and to all intents and purposes constitute a part of the frame.

Having thus described the invention, what is claimed is 1. In a device of the class described, a frame; a carriage mounted to reciprocate on the frame; a drill-rotatably and slidably mounted in the carriage; a grip frictionally.

held on the drill; a clutch rotatable on the drill and coacting with the grip; carriage engaging spring means coacting with the clutch to cause the same to engage with the grip; means for rotating the clutch; and stop mechanism engaging the clutch to hold the clutch and the grip against movement as the drill advances, thereby to permit the drill to feed independently of the grip.

2. In a device of the class described, a frame; a carriage mounted to reciprocate thereon; a drill slidable and rotatable in the carriage; a grip on the drill; a clutch on the drill and engaging the grip; a carriage engaging spring means coacting with the clutch 0 press the same against the grip when t e carriage is retracted, the drill be ing movable due to the action of .the spring means and independently of the carriage when the carriage is retracted, thereby to' frame; a carriage mounted to reciprocatethereon; a drill slidable and rotatable in the carriage; a grip frictionally held on the drill; a clutch journaled on the drill and engaging the grip; a carriage engaging spring means coacting with the clutch to press the same against the grip when the carriage is retracted, the drill being movable under the action of the spring means independently of the carriage when the carriage is retracted, thereby to lessen the pressure of the spring means on the clutch; means for actuating the clutch to rotate the drill; and stop mechanism engaging the clutch as the drill advances, thereby stopping the movement of the clutch and the grip and permitting the drill to feed automatically through the grip.

4. In a device of the class described, a frame; a carriage mounted to reciprocate thereon; a drill mounted 'to rotate in the carriage; a grip on the drill; a clutch on the drill and coacting with the gripz'carriage engaging spring means for holding the clutch and the grip in contact; and a link, having pivotal connections with the frame and the clutch.

5. In a device of the class described, a frame; a carriage mounted to reciprocate thereon; a drill mounted to rotate and to slide in the carriage; a grip frictionally held on the drill; a clutch rotatable on the drill and coacting with the grip; a carriage engaging spring means coacting with the clutch to press the clutch against the grip; 4

a link 'pivotally connected to the clutch and to the frame; and a stop member carried by the frame, the clutch coacting with the stop member when the drill advances, thereby permitting the drill to feed automatically through the grip.

6. In a device of the, class described, a frame including guides; a yoke connecting the guides; a carriage mounted to IGClPIO? cate on the guides and provided with upper and lower extensions; a drill mounted to reciprocate and to rotate in the extensions and, in the yoke; a grip frictionally held on the drill between the extensions; a clutch journaled on the drill and coacting with the grip; a spring surrounding the drill and located between the grip and one extension; a

spring surrounding the drill and located between the clutch and the other extension; at stop mounted on one guide and passing slidably through the clutch and coacting with the clutch to limit the movement thereof in the direction in which the drill feeds; a bracket on the other guide; a link pivoted to the clutch and to the bracket; and a spring connected with the bracket and the link and constituting means for rotating the clutch and the drill.

In testimony that I claim the foregoing'as my own, I have hereto affixed my signature in the presence of tWo witnesses.

ALBERT HOSSFELD.

Witnesses:

R. L. THOMPSON, J. J. LITCHER. 

